<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">
        {{msg}}
        <input v-model="msg">
        
    </div>
    <script>
        // 刷新之后会重新实例化一个Vue对象。
        var vm = new Vue({
            el: '#app',
            data: {
                msg: 'hello vue'
            },
            watch: {
                
            }
        })
    </script>
</body>
</html>